Balanced slide-valve.



No. 696,7I8. Patented` Apr. |902.

F. C. CHARLES. BALANCE SLIDE VALVE.

(Application ma mar. 12.1901.) (No Model.)

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FRANK C. CHARLES, OF CEDAR RAPlDS, IOVA.

BALANCED SLIDE-VALVE.

.'SEEGXFIIGATON forming part of Letters Patent No. 696,7' 18, dated April 1, 1902. Appnamnieanmli12,1901. serrano. 50,831. (remodel.)

To all wtont it may concern:

Be it known that I, FRANK C. CHARLES, of the city of Cedar Rapids, Linn county, State of Iowa, have invented certain new and useful Improvements in Balanced Slide-Valves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to balanced slidevalves; and it consists of the novel construction, combination, and arrangement of parts hereinafter shown, described, and claimed.

My invention relates specifically to that class of balanced slide-valves wherein Vthe steam-pressure tending to keep the valve on its seat is partially relieved by a balanceplate which prevents access of steam tothe larger portion of the upper area of the valve.

The object of my invention is to provide an improved balanced slide-valve which shall possess advantages in point of simplicity and durability.

In the drawings, Figure 1 is a sectional side elevation through a portion of the steam-engine cylinder and steam-chest having myinvention applied thereto. Fig. 2 is an elevation of the slide-valve and the balancing devices carried thereby. Fig. 3 is a section on the line 3 3 of Fig. 4. Fig. 4L is a plan view of the devices shown in Fig. 2. Fig. 5 is a plan View with the packing-ring removed. Fig. 6 is a detail section showing the constructionof the packing-ring and its springring.

1 indicates the engine-cylinder, having the usual steam and exhaust ports, and to which cylinder is secured in the usual manner the steam-chest 2 and itscover 3. I have not deemed it necessary to show the bolts which hold the cover in place.

4 indicates the slide-valve, carrying upon its upper side a circular disk 5, which is secured in position by means of suitable bolts or screws 6. Formed in the outer face of said` disk is -an annular groove or recess, the parallel surfaces 7 and 8 of which extend at a right angle to the top of said disk. The bottom surface 17 of the groove surrounds the face 7 and is at a right angle thereto, so that the spring-ring, hereinafter referred to, will always be supported. at the same height, whether it be expanded or contracted.

Closely fitted to slide upon the wall 7 is a packing-ring 9, the outer face of which is beveled at 10 and the upper face of which is secu rely urged into contact with a balance-plate 11 by means of a spring-ring 12, which latter is made rounding or beveled on the top inner edge at 13, (see Fig. 6,) so that the said beveled face 10 of said packing-ring may readily slide upon the spring-ring during operation. Said spring-ring is cut at 14, so that it may expand and contract during operation, and the said packing-ring 9 may be cut at 15 for taking up the wear, whereby it may be snugly iitted at all times to the vertical Wall 7. Said spring-ring is carried or supported upon the Asurface 17 of the disk, and when the cover to the steam-chest, with balance-plate attached thereto, is put in place it forces the packing-ring 9 into the spring-ring, expand ing the same on the said surface 17, which is of sufficient width to permit the said ring 12 to expand when the packing-ring is forced down into working position or until the top of the packing-ring is nearly even with the top of the disk. Vhen the packing-ring 9 and the spring-ring 12 are in this position, the elasticity of the said spring-ring comes into action, tending to return it 4to its original size, and this force acting against the packingring urges the latter into contact with'the balance-plate 11, which is held in position in a l V when the cover 3 is placed in position as shown the balance-plate 11 will force the packing-ring 9 downwardly, and thereby expand the spring-ring 12, and the elasticity of said spring-ring acting through the beveled face 10 of said packing-ring Will hold the said packing-ring firmly in position against the said balance-plate, and thereby form a tight joint. In case of breakage of said springring l2 its pieces will be caught in the said' groove, and the outer Wall S Will prevent said pieces from falling onto the valve-seat.

It is obvious that slight changes in the contour ofthe rings 9 and 12 maybe made Without departing from the scope of my invention-as, for instance,` the said packingring may be rectangular in cross-section instead of V-shaped, as now shown, andthe upper edge of the said spring-ring l2 may be beveled toa greater degree, it only being essential that the packing-ring be the inner ring and the spring-ring exterior thereof.

I claiml. In a balanced slide-valve, the combina- A tion of a valve having a disk attached thereto provided With two surfaces located at right angles to each other, a packing-ring fitting upon one of said surfaces and a spring-ring located upon the other ot' said surfaces and encircling the packing-ring to uphold the latter, and a balance-plate above the said packing-ring.

2. Theiinproved balanced slide-Valve,con1 prising a valve, a disk secured thereto and having a vertical face 7 and a horizontal surface 17, a packing-ring engaging the said face 7, a spring-ring carried upon the horizontal surface 17 and encircling the said packing-ring, the contacting surfaces of said two rings being relatively beveled or inclined so that the elasticity of the said spring-ring will act through its beveled or inclined surface to hold the packing-ring firmly against the balance-plate.

In testimony whereof I affix iny signature in presence of two Witnesses.

FRANK C. CHARLES.

Witnesses:

W. A. BRADLEY, W. J. MONROE. 

